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JOHN L. MASN, 0F NEW YURK, N. Y.

Specification forming part of Letters Patent No. mlhl, dated November30, 1858.

To all whom it may concern..-

Beit known that I, .l'oHN L. MASON, of the city, county, and State ofNew York, have invented new and useful Improvements in the Necks ofBottles, Jars, &c., especially such as are intended to be air and watertight, such as are used for sweetmeats, &c., of which the following is aspecification.

Screw-tops or nozzles and caps for the same, I have already presented tothe public, and have my patents for the same; but I now present a glassjar having important improvements over any jars which can be produced bymy former process or tools.

When the jar or bottle is made of glass in a mold, the mode ofmanufacture enables me to introduce improvements which could not beproduced in spinning, and also such as are important in reference to thematerial used for the jar or bottle. I make the thread on the exteriorof the neck, and leave a. portion of the neck above the thread of sucndiameter that the bottom of the groove between the thread shall be fullyflush with it, and I also terminat the screwthread at the lower endbefore it reaches the shoulder-swell of the bottlc or jar, leavingbetween the lower end of the thread and the shoulder a groove directlyaround of a depth which makes it flush with the bottom of thethread-groove. The thread at both ends is made to vanish into the neckbefore it reaches the top or the bottom thereof. The advantage of thefirst is that, if the thread of the screw cvtended to the upper end,itwould be marred by the grinding to finish the end of the neck, and wouldpresent sharp points which would cut and injure the cap intended for it,and would continue to break, and if the part above the thread were ofgreater diameter than flush with the bottom of the screw-groove, itwould not receive the screw-cap. And the advantage of the second isthat, if the screw-thread, as heretofore, should extend to the shoulderof the bottle, the screw-cap would be interrupted in coming down to theshoulder, and the india-rubber washer could not fitclosely to itsposition. and thus the air-tight qualities of the bottle or jar would beimpaired.

The drawing A represents the top or noz zle of the bottle. Thescrew-thread, as is obvious, terminates before reaching the top or thebottom of the neck.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A screw neck or nozzle of a jar or bottle, in combination with agroove separating the thread from the shoulder of the bottle or jar. asdescribed.

2. A screw ou the exterior of the neck of a bottle or jar in which theneck extends above the screw-thread and the thread vanishesinto thc neckof the bottle or jar, substantially as described.

JOHN. L. MASON. XVit-nesses:

W. P. N. krzer-neuh, J. M. Mmm n'.

